Evaporative crystallization apparatus

Abstract

The application provides an evaporation crystallization device, which comprises a reaction kettle, a glass condenser, a chilled water circulation module and a first collecting bottle; the reaction kettle is used for evaporating and crystallizing materials, and is provided with a steam outlet for steam discharge; the glass condenser comprises a glass shell and a glass heat exchange coil; the glass shell is provided with a water inlet, a water outlet, a lower interface and a vacuumizing port; the vacuumizing port is connected to a vacuum unit; the glass heat exchange coil is accommodated in the glass shell and connected to the water inlet and the water outlet at two ends respectively; the glass shell is arranged in an inclined manner so that the water inlet is lower than the water outlet; the lower interface is connected to the lowest end of the glass shell in the inclined arrangement; and the lower interface is connected to the steam outlet; the chilled water circulation module comprises an inflow pipeline and a return pipeline; the inflow pipeline is connected to the water inlet; the return pipeline is connected to the water outlet; and the inflow pipeline and the return pipeline are arranged so that the glass heat exchange coil only bears the water pressure formed by the height difference between the water inlet and the water outlet.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of solid substance preparation, and more particularly, to an evaporation crystallization device. BACKGROUND

[0002] Evaporation crystallization is one of the commonly used methods for solid substance preparation. In the traditional evaporation crystallization technology, the solution (consisting of solute and solvent, also known as liquid material) in the reaction kettle (i.e. crystallization kettle) is heated to evaporate the solvent, the evaporated solvent is removed from the reaction kettle by vacuum pumping and then enters the glass condenser for condensation and recovery, the solution in the reaction kettle changes from unsaturated to saturated, and the excess solute will be precipitated in the form of crystals.

[0003] Generally, the glass condenser has a glass shell and a glass heat exchange coil, the glass shell is provided with a water inlet and a water outlet, the glass heat exchange coil is accommodated in the glass shell and connected to the water inlet and the water outlet of the glass shell at both ends, the water inlet and the water outlet are used to connect to the external circulating cooling water, the external circulating cooling water enters the glass heat exchange coil through the water inlet and is discharged back through the water outlet. The external circulating cooling water is powered by a pump.

[0004] When the external circulating cooling water circulates through the water inlet of the glass shell, the glass heat exchange coil and the water outlet of the glass shell, the pressure at the water inlet is greater than that at the water outlet, and the pressure difference between the water inlet and the water outlet needs to meet the circulating flow, which is usually much higher than the pressure formed by the height difference between the water inlet and the water outlet, which makes the glass heat exchange coil bear a large pressure, and thus there is a risk of explosion of the glass heat exchange coil. SUMMARY

[0005] In view of the problems in the background art, an object of the present disclosure is to provide an evaporation crystallization device which can reduce the pressure borne by the glass heat exchange coil, thereby reducing the risk of explosion of the glass heat exchange coil.

[0006] Thus, the evaporation crystallization device comprises a reaction kettle, a glass condenser, a chilled water circulation module, and a first collection bottle; the reaction kettle is used for evaporating and crystallizing liquid material therein; the upper portion of the reaction kettle is provided with a steam outlet for discharging gaseous substances evaporated from the material in the form of steam during evaporation and crystallization; the glass condenser comprises a glass shell and a glass heat exchange coil; the glass shell is provided with a water inlet, a water outlet, a lower interface, and a vacuumizing port; the vacuumizing port is used for being connected to a vacuum unit; the glass heat exchange coil is accommodated in the glass shell and connected to the water inlet and the water outlet of the glass shell at two ends respectively; the glass shell is arranged obliquely so that the water inlet is lower than the water outlet; the lower interface is connected to the lowest end of the glass shell; and the lower interface is used for being connected to the steam outlet of the reaction kettle; the chilled water circulation module comprises an inflow pipeline and a backflow pipeline; the inflow pipeline is used for being connected to the water inlet of the glass shell to supply chilled water; and the backflow pipeline is used for being connected to the water outlet of the glass shell to make the chilled water backflow; the inflow pipeline and the backflow pipeline are arranged so that the glass heat exchange coil only bears the water pressure formed by the height difference between the water inlet and the water outlet; the first collection bottle is communicated with the lower interface of the glass condenser; and the glass condenser, the chilled water circulation module, and the first collection bottle are configured together to: draw the gaseous substances evaporated in the reaction kettle into the glass shell of the glass condenser through the lower interface of the glass condenser from the steam outlet of the reaction kettle via the negative pressure formed by the vacuumizing port of the vacuum unit, so as to exchange heat with the chilled water flowing in the glass heat exchange coil and condense into condensed liquid, and make the condensed liquid in the glass shell backflow to the first collection bottle through the lower interface to be collected in the first collection bottle.

[0007] The evaporation crystallization device according to the present disclosure has the following advantages: in the evaporation crystallization device according to the present disclosure, the glass shell is arranged obliquely so that the water inlet is lower than the water outlet to form a height difference between the water inlet and the water outlet; the chilled water forms a circulating flow via the inflow pipeline, the water inlet of the glass shell, the glass heat exchange coil, the water outlet of the glass shell, and the backflow pipeline; the inflow pipeline and the backflow pipeline are arranged so that the glass heat exchange coil only bears the water pressure formed by the height difference between the water inlet and the water outlet; thus, the difference between the pressure of the water inlet and the pressure of the water outlet is equal to the water pressure formed by the height difference between the water inlet and the water outlet, which can reduce the pressure borne by the glass heat exchange coil compared with the background art, thereby reducing the risk of the glass heat exchange coil bursting. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a structural layout diagram of the evaporation crystallization device according to the present disclosure.

[0009] In the drawings, the reference signs are explained as follows:

[0010] 100 evaporation crystallization device

[0011] 1 reaction kettle

[0012] 11 steam outlet

[0013] 12 kettle body

[0014] 13 jacket

[0015] 14 agitator

[0016] 2 glass condenser

[0017] 21 glass shell

[0018] 211 water inlet

[0019] 211a inlet end

[0020] 212 water outlet

[0021] 212a outlet end

[0022] 213 lower interface

[0023] 214 vacuum port

[0024] 22 glass heat exchange coil

[0025] 3 chilled water circulation module

[0026] 31 inflow pipe

[0027] 32 backflow pipe

[0028] W corrugated pipe

[0029] 33 chilled water unit

[0030] 34 heat preservation water tank

[0031] 341 outlet

[0032] 342 backflow port

[0033] 343 exhaust port

[0034] 344 water replenishment port 345 float ball valve

[0035] 346 overflow port

[0036] 35 connecting pipe

[0037] 36 pump

[0038] 37a first valve

[0039] 37b second valve

[0040] 37c third valve

[0041] 37d fourth valve

[0042] 38a first pressure gauge

[0043] 38b second pressure gauge

[0044] 38c third pressure gauge

[0045] 39 thermometer

[0046] 4 first collection bottle

[0047] 41 first bottle body

[0048] 42 first upper inlet

[0049] 43 connecting pipe

[0050] 44 first lower outlet

[0051] C four-fluorine flexible connection

[0052] 5 second collection bottle

[0053] 51 second bottle body

[0054] 52 second upper inlet

[0055] 53 second lower outlet

[0056] 54 first discharge valve

[0057] 55 second discharge valve DETAILED DESCRIPTION

[0058] The accompanying drawings illustrate embodiments of the present disclosure and it will be understood that the disclosed embodiments are merely examples of the present disclosure, the present disclosure can be implemented in various forms, therefore, the specific details disclosed herein should not be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching those of ordinary skill in the art to implement the present disclosure in various ways.

[0059] Referring to Figure 1 , the evaporation crystallization apparatus 100 according to the present disclosure includes a reaction kettle 1, a glass condenser 2, a chilled water circulation module 3, and a first collection bottle 4.

[0060] The reaction kettle 1 is used for evaporative crystallization of liquid material in the reaction kettle 1, and the upper portion of the reaction kettle 1 is provided with a steam outlet 11 for discharging gaseous substances evaporated from the material in the evaporative crystallization as steam. The glass condenser 2 comprises a glass shell 21 and a glass heat exchange coil 22, the glass shell 21 is provided with a water inlet 211, a water outlet 212, a lower interface 213, and a vacuum port 214 for connecting to a vacuum unit (not shown), and the glass heat exchange coil 22 is received in the glass shell 21 and connected to the water inlet 211 and the water outlet 212 of the glass shell 21 at two ends respectively, the glass shell 21 is arranged obliquely so that the water inlet 211 is lower than the water outlet 212, and the lower interface 213 is connected to the lowest end of the oblique glass shell 21, and the lower interface 213 is used for connecting to the steam outlet 11 of the reaction kettle 1. The chilled water circulation module 3 comprises an inflow pipe 31 and a return pipe 32, the inflow pipe 31 is used for connecting to the water inlet 211 of the glass shell 21 to supply chilled water, and the return pipe 32 is used for connecting to the water outlet 212 of the glass shell 21 to return the chilled water, and the inflow pipe 31 and the return pipe 32 are arranged so that the glass heat exchange coil 22 only bears the water pressure formed by the height difference between the water inlet 211 and the water outlet 212. The first collection bottle 4 is communicated with the lower interface 213 of the glass condenser 2. The glass condenser 2, the chilled water circulation module 3 and the first collection bottle 4 are configured to: the evaporated gaseous substances in the reaction kettle 1 are drawn into the glass shell 21 of the glass condenser 2 from the steam outlet 11 of the reaction kettle 1 through the lower interface 213 of the glass condenser 2 by the negative pressure formed by the vacuum unit through the vacuum port 214, and are condensed into condensed liquid by heat exchange with the chilled water flowing in the glass heat exchange coil 22 from the chilled water circulation module 3, and the condensed liquid in the glass shell 21 is returned downward to the first collection bottle 4 through the lower interface 213 to be collected into the first collection bottle 4.

[0061] In the evaporative crystallization device 100 according to the present disclosure, the glass shell 21 is arranged obliquely so that the water inlet 211 is lower than the water outlet 212 to form a height difference between the water inlet 211 and the water outlet 212, the chilled water is circulated through the inflow pipe 31, the water inlet 211 of the glass shell 21, the glass heat exchange coil 22, the water outlet 212 of the glass shell 21 and the return pipe 32, and the inflow pipe 31 and the return pipe 32 are arranged so that the glass heat exchange coil 22 only bears the water pressure formed by the height difference between the water inlet 211 and the water outlet 212, so that the difference between the pressure of the water inlet 211 and the pressure of the water outlet 212 is equal to the water pressure formed by the height difference between the water inlet 211 and the water outlet 212, which can reduce the pressure borne by the glass heat exchange coil 22 compared with the background art, thereby reducing the risk of bursting of the glass heat exchange coil 22.

[0062] In the evaporation crystallization device 100 according to the present disclosure, the water inlet 211 is lower than the water outlet 212 so that the chilled water fills the glass heat exchange coil 22, ensuring the overall function and heat exchange effect of the glass heat exchange coil 22.

[0063] It is noted that the liquid material is a solution, which is composed of a solute and a solvent. The solvent can be any suitable solvent suitable for the solute to be evaporated and crystallized. The gaseous substance evaporated from the material is the steam formed by the evaporation of the solvent.

[0064] The reactor 1 may be a glass reactor, so that an operator can visually monitor the evaporation and crystallization process in the reactor 1 from the outside.

[0065] like Figure 1 As shown, in one example, a reactor 1 includes a reactor body 12, a jacket 13, and an agitator 14. The reactor body 12 is used to hold the material to be evaporated and crystallized, and a steam outlet 11 is provided at the top of the reactor body 12. The jacket 13 surrounds the reactor body 12 and is used to heat the reactor body 12 to evaporate and crystallize the material within the reactor body 12. For example, the jacket 13 can be heated by passing heated steam from an external source. The agitator 14 is provided within the reactor body 12 and is used to stir the material within the reactor body 12.

[0066] When the glass shell 21 is tilted, the water pressure generated by the height difference between the water inlet 211 and the water outlet 212 on the glass heat exchange coil 22 is lower than when the glass shell 21 is vertically arranged. In one example, the tilt angle of the glass shell 21 is 10-45 degrees relative to the horizontal plane. Figure 1 In the embodiment, the glass housing 21 is tilted at an angle of 10° relative to the horizontal plane, so that the height difference between the water inlet 211 and the water outlet 212 is at a minimum.

[0067] like Figure 1 As shown, the glass heat exchange coil 22 is spirally wound, thereby increasing the heat exchange effect and efficiency between the heat exchange coil 22 and the evaporated gaseous substances in the reactor 1. The glass heat exchange coil 22 can be formed by one or more spirally wound glass tubes. The axial length of the glass housing 21 and the glass heat exchange coil 22 can be appropriately selected based on the heat exchange effect.

[0068] like Figure 1 As shown, in one example, the inner diameter of the return pipe 32 is larger than the inner diameter of the inlet pipe 31, and after the water flows through the outlet 212, it flows horizontally for a period of time and then flows downward, so that the pressure of the return chilled water in the return pipe 32 at the outlet 212 is normal pressure. Figure 1The chilled water circulation module 3 further comprises a chilled water unit 33, a heat preservation water tank 34, a connecting pipe 35, and a pump 36. The heat preservation water tank 34 has an outlet 341, a backflow port 342, and an exhaust port 343 for making the pressure inside the heat preservation water tank 34 consistent with the atmospheric pressure. The inflow pipe 31 is connected between the chilled water unit 33 and the water inlet 211 of the glass housing 21. The backflow pipe 32 is connected between the water outlet 212 of the glass housing 21 and the backflow port 342 of the heat preservation water tank 34. The connecting pipe 35 is connected between the chilled water unit 33 and the outlet 341 of the heat preservation water tank 34. The pump 36 is arranged in the connecting pipe 35. The heat preservation water tank 34 is used for containing pre-stored water and receiving the chilled water after heat exchange via the backflow pipe 32 and the backflow port 342 of the heat preservation water tank 34. The pump 36 is used for pumping the water and / or the backflow chilled water in the heat preservation water tank 34 to the chilled water unit 33 via the connecting pipe 35 and the outlet 341 of the heat preservation water tank 34. The chilled water unit 33 is used for chilling the water and / or the backflow chilled water pumped thereto to form the chilled water supplied to the water inlet 211 of the glass housing 21 via the inflow pipe 31 by the pressure of the pump 36. The pump 36 is set to provide a pressure such that the pressure difference between the chilled water reaching the water inlet 211 of the glass housing 21 via the connecting pipe 35, the chilled water unit 33, and the inflow pipe 31 and the pressure of the chilled water at the water outlet 212 of the glass housing 21 is equal to the water pressure formed by the height difference between the water inlet 211 and the water outlet 212.

[0069] As shown in FIG. 1, in an example, the inflow pipe 31 is connected to the water inlet 211 in a corrugated tube W to serve as a buffer to stabilize the pressure at the water inlet 211 of the glass housing 21. Figure 1 As shown in FIG. 1, in an example, the backflow pipe 32 is connected to the water outlet 212 in a corrugated tube W to serve as a buffer to stabilize the pressure at the water outlet 212 of the glass housing 21.

[0070] As shown in FIG. 1, in an example, the inflow pipe 31 is connected to the water inlet 211 in a corrugated tube W to serve as a buffer to stabilize the pressure at the water inlet 211 of the glass housing 21. Figure 1

[0071] Referring to FIG. 1, in an example, the heat preservation water tank 34 further has a water supplement port 344 and a float valve 345. The water supplement port 344 and the float valve 345 are used to open the water supplement port 344 by the float valve 345 at the water supplement port 344 due to its own gravity and the water level drop when the water level in the heat preservation water tank 34 drops to a certain height, to supplement water in the heat preservation water tank 34, and to close the water supplement port 344 by the float valve 345 rising due to the water level rise when the water is added to a certain height. Thus, the continuity and persistence of the circulation of the chilled water in the chilled water circulation module 3 are ensured. Figure 1 Referring to FIG. 1, in an example, the heat preservation water tank 34 further has a water supplement port 344 and a float valve 345. The water supplement port 344 and the float valve 345 are used to open the water supplement port 344 by the float valve 345 at the water supplement port 344 due to its own gravity and the water level drop when the water level in the heat preservation water tank 34 drops to a certain height, to supplement water in the heat preservation water tank 34, and to close the water supplement port 344 by the float valve 345 rising due to the water level rise when the water is added to a certain height. Thus, the continuity and persistence of the circulation of the chilled water in the chilled water circulation module 3 are ensured.

[0072] Figure 1 ​​In an example, the water tank 34 further has an overflow port 346 which is located lower than the backflow port 342. The overflow port 346 is used to prevent the water from the water tank 34 from overflowing from the backflow port 342 when the water level in the water tank 34 reaches the overflow port 346, thereby ensuring the smooth circulation of the chilled water in the chilled water circulation module 3. Figure 1 In an example, the backflow port 342 is provided on the top cover of the water tank 34, and the overflow port 346 is provided on the peripheral wall of the water tank 34 and is located lower than the backflow port 342 in the vertical direction.

[0073] Referring to Figure 1 In an example, the chilled water circulation module 3 further comprises a first valve 37a, a second valve 37b, a third valve 37c, and a fourth valve 37d. The first valve 37a is provided on the inflow pipe 31 and is used to control the communication or non-communication of the inflow pipe 31. The second valve 37b is provided on the backflow pipe 32 and is used to control the communication or non-communication of the backflow pipe 32. The third valve 37c and the fourth valve 37d are provided on the connecting pipe 35 and are located on opposite sides of the pump 36, and are used to control the communication or non-communication of the connecting pipe 35.

[0074] In addition, referring to Figure 1 In an embodiment, the chilled water circulation module 3 further comprises a first pressure gauge 38a and a second pressure gauge 38b. The first pressure gauge 38a is provided on the inflow pipe 31 at the water inlet 211 of the glass housing 21. The second pressure gauge 38b is provided on the backflow pipe 32 at the water outlet 212 of the glass housing 21. The first pressure gauge 38a and the second pressure gauge 38b are used to monitor the pressure difference between the chilled water at the water inlet 211 of the glass housing 21 and the chilled water at the water outlet 212 of the glass housing 21, thereby improving the working safety of the glass condenser 2 and the glass heat exchange coil 22 thereof. The first pressure gauge 38a and the second pressure gauge 38b can be communicatively connected to an external monitoring device.

[0075] In addition, referring to Figure 1 In an example, the chilled water circulation module 3 further comprises a third pressure gauge 38c and a thermometer 39. The third pressure gauge 38c is provided on the inflow pipe 31 and is used to detect the pressure of the chilled water in the inflow pipe 31. The thermometer 39 is provided on the inflow pipe 31 and is used to detect the temperature of the chilled water in the inflow pipe 31.

[0076] As Figure 1As shown, in an example, the first collecting bottle 4 comprises a first bottle body 41, a first upper inlet 42, and a connecting pipe 43. The first upper inlet 42 is arranged at the top of the first bottle body 41, the lower end of the first upper inlet 42 is communicated with the interior of the first bottle body 41, and the upper end of the first upper inlet 42 is connected to the lower interface 213 of the glass shell 21 from below. The connecting pipe 43 is arranged at the lateral side of the first bottle body 41, one end of the connecting pipe 43 is communicated with the interior of the first bottle body 41, and the other end of the connecting pipe 43 is connected to the steam outlet 11 of the reaction kettle 1. The steam outlet 11 of the reaction kettle 1, the connecting pipe 43, the space above the connecting pipe 43 in the interior of the first bottle body 41, the first upper inlet 42, and the lower interface 213 of the glass condenser 2 form a path for the evaporated gaseous substance in the reaction kettle 1 to flow into the glass shell 21 of the glass condenser 2. The lower interface 213 of the glass condenser 2 and the space above the connecting pipe 43 in the interior of the first bottle body 41 form a path for the condensed liquid in the glass shell 21 of the glass condenser 2 to flow back. The space below the connecting pipe 43 in the interior of the first bottle body 41 is used to collect the backflow condensed liquid. Thus, the first collecting bottle 4 integrates the path for the evaporated gaseous substance in the reaction kettle 1 to flow into the glass shell 21 of the glass condenser 2, the path for the condensed liquid in the glass shell 21 of the glass condenser 2 to flow back, and the collection of the backflow condensed liquid.

[0077] In an example, the connecting pipe 43 and the steam outlet 11 of the reaction kettle 1 are connected through a Teflon soft connection C. Thus, through the Teflon soft connection C, the vibration caused by the stirrer 14 stirring in the kettle body 12 is buffered and absorbed, so as to avoid the vibration being transmitted to the glass condenser 2 through the first collecting bottle 4 and damaging the glass condenser 2, thereby improving the working reliability and safety of the glass condenser 2.

[0078] Referring to Figure 1 In an example, the first collecting bottle 4 has a first lower outlet 44. The evaporation crystallization device 100 further comprises a second collecting bottle 5. The second collecting bottle 5 is controlled to be communicated with the first lower outlet 44 of the first collecting bottle 4 so as to communicate the first collecting bottle 4 and make the condensed liquid in the first collecting bottle 4 flow into the second collecting bottle 5 when the condensed liquid collected by the first collecting bottle 4 reaches a certain amount. Thus, the first collecting bottle 4 can only serve as a buffer transition function, which is beneficial to the miniaturization of the first collecting bottle 4.

[0079] Specifically, as Figure 1As shown, the second collecting bottle 5 has a second bottle body 51, a second upper inlet 52, a second lower outlet 53, a first lower valve 54, and a second lower valve 55. The second upper inlet 52 extends upwardly from the second bottle body 51 and is detachably connected to the first lower outlet 44 of the first collecting bottle 4. The first lower valve 54 is arranged at the second upper inlet 52 and is used to control the communication and non-communication of the second upper inlet 52. The second lower outlet 53 extends downwardly from the second bottle body 51 and has an open bottom end. The second lower valve 55 is arranged at the second lower outlet 53 and is used to control the communication and non-communication of the second lower outlet 53.

[0080] A number of exemplary embodiments have been described above with the understanding that the foregoing is intended to be illustrative only and not limiting of the claimed invention. Thus, unless otherwise stated, the various features of the disclosure disclosed herein can be combined together to form additional combinations that are not shown for the sake of brevity.

Claims

1. An evaporative crystallization device, characterized in that, the evaporative crystallization device (100) comprises a reaction kettle (1), a glass condenser (2), a chilled water circulation module (3), and a first collection bottle (4); the reaction kettle (1) is used for evaporative crystallization of a liquid material therein, and an upper portion of the reaction kettle (1) is provided with a steam outlet (11) for discharging gaseous substances evaporated from the material in the form of steam during evaporative crystallization; the glass condenser (2) comprises a glass shell (21) and a glass heat exchange coil (22), the glass shell (21) is provided with a water inlet (211), a water outlet (212), a lower interface (213), and a vacuum port (214) for being connected to a vacuum unit, the glass heat exchange coil (22) is accommodated in the glass shell (21) and connected to the water inlet (211) and the water outlet (212) of the glass shell (21) at two ends respectively, the glass shell (21) is arranged obliquely so that the water inlet (211) is lower than the water outlet (212), and the lower interface (213) is connected to the lowest end of the oblique glass shell (21), and the lower interface (213) is used for being connected to the steam outlet (11) of the reaction kettle (1); the chilled water circulation module (3) comprises an inflow pipe (31) and a return pipe (32), the inflow pipe (31) is used for being connected to the water inlet (211) of the glass shell (21) to supply chilled water, and the return pipe (32) is used for being connected to the water outlet (212) of the glass shell (21) to return the chilled water; the first collection bottle (4) is communicated with the lower interface (213) of the glass condenser (2); the glass condenser (2), the chilled water circulation module (3), and the first collection bottle (4) are configured together to: the gaseous substances evaporated in the reaction kettle (1) are drawn into the glass shell (21) of the glass condenser (2) from the steam outlet (11) of the reaction kettle (1) through the lower interface (213) of the glass condenser (2) by the negative pressure formed by the vacuum unit through the vacuum port (214), and are condensed into condensed liquid by heat exchange with the chilled water from the chilled water circulation module (3) flowing in the glass heat exchange coil (22), and the condensed liquid in the glass shell (21) is returned downward to the first collection bottle (4) through the lower interface (213) to be collected into the first collection bottle (4); the chilled water circulation module (3) further comprises a chilled water unit (33), a connecting pipe (35), and a pump (36); the chilled water unit (33) is used for chilling and cooling the water and / or the returned chilled water sent into it by the pump (36) to form the chilled water supplied to the water inlet (211) of the glass shell (21) by the pressure of the pump (36) through the inflow pipe (31). The pump (36) is set to provide a pressure to the pump (36) such that the pressure difference between the chilled water reaching the water inlet (211) of the glass enclosure (21) via the connecting pipe (35), the chilled water unit (33), the inflow pipe (31) and the chilled water at the water outlet (212) of the glass enclosure (21) is equal to the water pressure formed by the height difference between the water inlet (211) and the water outlet (212).

2. The evaporative crystallization device according to claim 1, wherein The angle of the inclination of the glass enclosure (21) is 10-45° relative to the horizontal plane.

3. The evaporative crystallization device according to claim 1, wherein The inner diameter of the return pipe (32) is larger than that of the inflow pipe (31), and after the water flows out of the water outlet (212), it flows downward for a certain distance so that the pressure of the returned chilled water at the water outlet (212) of the return pipe (32) is atmospheric pressure.

4. The evaporative crystallization device according to claim 3, wherein The part where the return pipe (32) is connected to the water outlet (212) is in a corrugated tube shape (W); The part where the inflow pipe (31) is connected to the water inlet (211) is in a corrugated tube shape (W).

5. The evaporative crystallization device according to claim 3, wherein The chilled water circulation module (3) further comprises a heat preservation water tank (34); The heat preservation water tank (34) has an outlet (341), a return port (342) and an exhaust port (343) for making the pressure inside the heat preservation water tank (34) consistent with the atmospheric pressure outside; The inflow pipe (31) is connected between the chilled water unit (33) and the water inlet (211) of the glass enclosure (21); The return pipe (32) is connected between the water outlet (212) of the glass enclosure (21) and the return port (342) of the heat preservation water tank (34); The connecting pipe (35) is connected between the chilled water unit (33) and the outlet (341) of the heat preservation water tank (34); The pump (36) is arranged in the connecting pipe (35); The heat preservation water tank (34) is used for containing the water put in advance and receiving the chilled water returned via the return pipe (32) and the return port (342) of the heat preservation water tank (34) after heat exchange; The pump (36) is used for pumping the water and / or the returned chilled water in the heat preservation water tank (34) to the chilled water unit (33) via the connecting pipe (35) and the outlet (341) of the heat preservation water tank (34).

6. The evaporative crystallization device according to claim 5, wherein The chilled water circulation module (3) further comprises a first pressure gauge (38a) and a second pressure gauge (38b); The first pressure gauge (38a) is arranged at the part of the inflow pipe (31) at the water inlet (211) of the glass enclosure (21); The second pressure gauge (38b) is arranged at the part of the return pipe (32) at the water outlet (212) of the glass enclosure (21). The first pressure gauge (38a) and the second pressure gauge (38b) are used to monitor the pressure difference between the chilled water at the water inlet (211) of the glass shell (21) and the chilled water at the water outlet (212) of the glass shell (21).

7. The evaporative crystallization device of claim 1, wherein, The first collection bottle (4) comprises a first bottle body (41), a first upper inlet (42), and a connecting pipe (43). The first upper inlet (42) is arranged at the top of the first bottle body (41), the lower end of the first upper inlet (42) is communicated with the inside of the first bottle body (41), and the upper end of the first upper inlet (42) is connected to the lower interface (213) of the glass shell (21) from below. The connecting pipe (43) is arranged at the side of the first bottle body (41), one end of the connecting pipe (43) is communicated with the inside of the first bottle body (41), and the other end of the connecting pipe (43) is connected to the vapor outlet (11) of the reaction kettle (1). The vapor outlet (11) of the reaction kettle (1), the connecting pipe (43), the space above the connecting pipe (43) in the inside of the first bottle body (41), the first upper inlet (42), and the lower interface (213) of the glass condenser (2) form a path for the evaporated gaseous substance in the reaction kettle (1) to flow into the glass shell (21) of the glass condenser (2). The lower interface (213) of the glass condenser (2) and the space above the connecting pipe (43) in the inside of the first bottle body (41) form a path for the condensed liquid in the glass shell (21) of the glass condenser (2) to flow back. The space below the connecting pipe (43) in the inside of the first bottle body (41) is used to collect the condensed liquid flowing back.

8. The evaporative crystallization device of claim 7, wherein, The connecting pipe (43) and the vapor outlet (11) of the reaction kettle (1) are connected by a soft connection (C) of tetrafluoride.

9. The evaporative crystallization device of claim 1, wherein, The first collection bottle (4) has a first lower outlet (44). The evaporative crystallization device (100) further comprises a second collection bottle (5). The second collection bottle (5) is controlled to be communicated with the first lower outlet (44) of the first collection bottle (4) to communicate the first collection bottle (4) and make the condensed liquid in the first collection bottle (4) flow into the second collection bottle (5) when the condensed liquid collected by the first collection bottle (4) reaches a certain amount.

10. The evaporative crystallization device of claim 9, wherein, The second collection bottle (5) has a second bottle body (51), a second upper inlet (52), a second lower outlet (53), a first discharge valve (54), and a second discharge valve (55). The second upper inlet (52) extends upward from the second bottle body (51) and is detachably connected to the first lower outlet (44) of the first collection bottle (4). The first discharge valve (54) is arranged at the second upper inlet (52) and is used to control the communication and non-communication of the second upper inlet (52). The second lower outlet (53) extends downward from the second bottle body (51) and has an open bottom end. The second discharging valve (55) is arranged at the second lower outlet (53), and is used for controlling the communication and non-communication of the second lower outlet (53).

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